/*
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* Copyright 2017 Google Inc.
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#ifndef SKSL_CPPCODEGENERATOR
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#define SKSL_CPPCODEGENERATOR
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#include "SkSLGLSLCodeGenerator.h"
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#include "SkSLSectionAndParameterHelper.h"
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#include <set>
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namespace SkSL {
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class CPPCodeGenerator : public GLSLCodeGenerator {
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public:
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CPPCodeGenerator(const Context* context, const Program* program, ErrorReporter* errors,
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String name, OutputStream* out);
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bool generateCode() override;
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private:
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void writef(const char* s, va_list va) SKSL_PRINTF_LIKE(2, 0);
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void writef(const char* s, ...) SKSL_PRINTF_LIKE(2, 3);
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bool writeSection(const char* name, const char* prefix = "");
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void writeHeader() override;
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bool usesPrecisionModifiers() const override;
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String getTypeName(const Type& type) override;
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void writeBinaryExpression(const BinaryExpression& b, Precedence parentPrecedence) override;
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void writeIndexExpression(const IndexExpression& i) override;
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void writeIntLiteral(const IntLiteral& i) override;
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void writeSwizzle(const Swizzle& swizzle) override;
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void writeFieldAccess(const FieldAccess& access) override;
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void writeVariableReference(const VariableReference& ref) override;
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String getSamplerHandle(const Variable& var);
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void writeIfStatement(const IfStatement& s) override;
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void writeReturnStatement(const ReturnStatement& s) override;
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void writeSwitchStatement(const SwitchStatement& s) override;
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void writeFunctionCall(const FunctionCall& c) override;
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void writeFunction(const FunctionDefinition& f) override;
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void writeSetting(const Setting& s) override;
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void writeProgramElement(const ProgramElement& p) override;
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void addUniform(const Variable& var);
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// writes a printf escape that will be filled in at runtime by the given C++ expression string
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void writeRuntimeValue(const Type& type, const Layout& layout, const String& cppCode);
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void writeVarInitializer(const Variable& var, const Expression& value) override;
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void writeInputVars() override;
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void writePrivateVars();
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void writePrivateVarValues();
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void writeCodeAppend(const String& code);
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bool writeEmitCode(std::vector<const Variable*>& uniforms);
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void writeSetData(std::vector<const Variable*>& uniforms);
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void writeGetKey();
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void writeOnTextureSampler();
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void writeClone();
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void writeTest();
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// If the returned C++ is included in the generated code, then the variable name stored in
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// cppVar will refer to a valid SkString that matches the Expression. Successful returns leave
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// the output buffer (and related state) unmodified.
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//
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// In the simplest cases, this will return "SkString {cppVar}(\"{e}\");", while more advanced
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// cases will properly insert format arguments.
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String convertSKSLExpressionToCPP(const Expression& e, const String& cppVar);
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// Process accumulated sksl to split it into appended code sections, properly interleaved with
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// the extra emit code blocks, based on statement/block locations and the inserted tokens
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// from newExtraEmitCodeBlock(). It is necessary to split the sksl after the program has been
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// fully walked since many elements redirect fOut to simultaneously build header sections and
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// bodies that are then concatenated; due to this it is not possible to split the sksl emission
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// on the fly.
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void flushEmittedCode();
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// Start a new extra emit code block for accumulating C++ code. This will insert a token into
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// the sksl stream to mark the fence between previous complete sksl statements and where the
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// C++ code added to the new block will be added to emitCode(). These tokens are removed by
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// flushEmittedCode() as it consumes them before passing pure sksl to writeCodeAppend().
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void newExtraEmitCodeBlock();
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// Append CPP code to the current extra emit code block.
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void addExtraEmitCodeLine(const String& toAppend);
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int getChildFPIndex(const Variable& var) const;
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String fName;
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String fFullName;
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SectionAndParameterHelper fSectionAndParameterHelper;
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std::vector<String> fExtraEmitCodeBlocks;
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std::vector<String> fFormatArgs;
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std::set<int> fWrittenTransformedCoords;
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// if true, we are writing a C++ expression instead of a GLSL expression
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bool fCPPMode = false;
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bool fInMain = false;
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// if not null, we are accumulating SkSL for emitCode into fOut, which
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// replaced the original buffer with a StringStream. The original buffer is
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// stored here for restoration.
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OutputStream* fCPPBuffer = nullptr;
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typedef GLSLCodeGenerator INHERITED;
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};
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}
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#endif
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